stream_encoder.h

在x86平台上运行不可信任代码的sandbox。

 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_write_callback(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderWriteCallback value);

/** Set the metadata callback.
 *  The supplied function will be called once at the end of encoding with
 *  the populated STREAMINFO structure.  This is so file encoders can seek
 *  back to the beginning of the file and write the STREAMINFO block with
 *  the correct statistics after encoding (like minimum/maximum frame size
 *  and total samples).
 *
 * \note
 * The callback is mandatory and must be set before initialization.
 *
 * \default \c NULL
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 *    \code value != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_metadata_callback(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderMetadataCallback value);

/** Set the client data to be passed back to callbacks.
 *  This value will be supplied to callbacks in their \a client_data
 *  argument.
 *
 * \default \c NULL
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_client_data(FLAC__StreamEncoder *encoder, void *value);

/** Get the current encoder state.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__StreamEncoderState
 *    The current encoder state.
 */
FLAC_API FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder);

/** Get the state of the verify stream decoder.
 *  Useful when the stream encoder state is
 *  \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__StreamDecoderState
 *    The verify stream decoder state.
 */
FLAC_API FLAC__StreamDecoderState FLAC__stream_encoder_get_verify_decoder_state(const FLAC__StreamEncoder *encoder);

/** Get the current encoder state as a C string.
 *  This version automatically resolves
 *  \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR by getting the
 *  verify decoder's state.
 *
 * \param  encoder  A encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval const char *
 *    The encoder state as a C string.  Do not modify the contents.
 */
FLAC_API const char *FLAC__stream_encoder_get_resolved_state_string(const FLAC__StreamEncoder *encoder);

/** Get relevant values about the nature of a verify decoder error.
 *  Useful when the stream encoder state is
 *  \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR.  The arguments should
 *  be addresses in which the stats will be returned, or NULL if value
 *  is not desired.
 *
 * \param  encoder  An encoder instance to query.
 * \param  absolute_sample  The absolute sample number of the mismatch.
 * \param  frame_number  The number of the frame in which the mismatch occurred.
 * \param  channel       The channel in which the mismatch occurred.
 * \param  sample        The number of the sample (relative to the frame) in
 *                       which the mismatch occurred.
 * \param  expected      The expected value for the sample in question.
 * \param  got           The actual value returned by the decoder.
 * \assert
 *    \code encoder != NULL \endcode
 */
FLAC_API void FLAC__stream_encoder_get_verify_decoder_error_stats(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_sample, unsigned *frame_number, unsigned *channel, unsigned *sample, FLAC__int32 *expected, FLAC__int32 *got);

/** Get the "verify" flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_verify().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_verify(const FLAC__StreamEncoder *encoder);

/** Get the "streamable subset" flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_streamable_subset().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder);

/** Get the "mid/side stereo coding" flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_get_do_mid_side_stereo().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder);

/** Get the "adaptive mid/side switching" flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_loose_mid_side_stereo().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder);

/** Get the number of input channels being processed.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_channels().
 */
FLAC_API unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder);

/** Get the input sample resolution setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_bits_per_sample().
 */
FLAC_API unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder);

/** Get the input sample rate setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_sample_rate().
 */
FLAC_API unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder);

/** Get the blocksize setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_blocksize().
 */
FLAC_API unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder);

/** Get the maximum LPC order setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_max_lpc_order().
 */
FLAC_API unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder);

/** Get the quantized linear predictor coefficient precision setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_qlp_coeff_precision().
 */
FLAC_API unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder);

/** Get the qlp coefficient precision search flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_do_qlp_coeff_prec_search().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder);

/** Get the "escape coding" flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_do_escape_coding().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder);

/** Get the exhaustive model search flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_do_exhaustive_model_search().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder);

/** Get the minimum residual partition order setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_min_residual_partition_order().
 */
FLAC_API unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder);

/** Get maximum residual partition order setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_max_residual_partition_order().
 */
FLAC_API unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder);

/** Get the Rice parameter search distance setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_rice_parameter_search_dist().
 */
FLAC_API unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder);

/** Get the previously set estimate of the total samples to be encoded.
 *  The encoder merely mimics back the value given to
 *  FLAC__stream_encoder_set_total_samples_estimate() since it has no
 *  other way of knowing how many samples the user will encode.
 *
 * \param  encoder  An encoder instance to set.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__uint64
 *    See FLAC__stream_encoder_get_total_samples_estimate().
 */
FLAC_API FLAC__uint64 FLAC__stream_encoder_get_total_samples_estimate(const FLAC__StreamEncoder *encoder);

/** Initialize the encoder instance.
 *  Should be called after FLAC__stream_encoder_new() and
 *  FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
 *  or FLAC__stream_encoder_process_interleaved().  Will set and return
 *  the encoder state, which will be FLAC__STREAM_ENCODER_OK if
 *  initialization succeeded.
 *
 *  The call to FLAC__stream_encoder_init() currently will also immediately
 *  call the write callback several times, once with the \c fLaC signature,
 *  and once for each encoded metadata block.
 *
 * \param  encoder  An uninitialized encoder instance.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__StreamEncoderState
 *    \c FLAC__STREAM_ENCODER_OK if initialization was successful; see
 *    FLAC__StreamEncoderState for the meanings of other return values.
 */
FLAC_API FLAC__StreamEncoderState FLAC__stream_encoder_init(FLAC__StreamEncoder *encoder);

/** Finish the encoding process.
 *  Flushes the encoding buffer, releases resources, resets the encoder
 *  settings to their defaults, and returns the encoder state to
 *  FLAC__STREAM_ENCODER_UNINITIALIZED.  Note that this can generate
 *  one or more write callbacks before returning, and will generate
 *  a metadata callback.
 *
 *  In the event of a prematurely-terminated encode, it is not strictly
 *  necessary to call this immediately before FLAC__stream_encoder_delete()
 *  but it is good practice to match every FLAC__stream_encoder_init()
 *  with a FLAC__stream_encoder_finish().
 *
 * \param  encoder  An uninitialized encoder instance.
 * \assert
 *    \code encoder != NULL \endcode
 */
FLAC_API void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder);

/** Submit data for encoding.
 *  This version allows you to supply the input data via an array of
 *  pointers, each pointer pointing to an array of \a samples samples
 *  representing one channel.  The samples need not be block-aligned,
 *  but each channel should have the same number of samples.
 *
 * \param  encoder  An initialized encoder instance in the OK state.
 * \param  buffer   An array of pointers to each channel's signal.
 * \param  samples  The number of samples in one channel.
 * \assert
 *    \code encoder != NULL \endcode
 *    \code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK \endcode
 * \retval FLAC__bool
 *    \c true if successful, else \c false; in this case, check the
 *    encoder state with FLAC__stream_encoder_get_state() to see what
 *    went wrong.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 * const buffer[], unsigned samples);

/** Submit data for encoding.
 *  This version allows you to supply the input data where the channels
 *  are interleaved into a single array (i.e. channel0_sample0,
 *  channel1_sample0, ... , channelN_sample0, channel0_sample1, ...).
 *  The samples need not be block-aligned but they must be
 *  sample-aligned, i.e. the first value should be channel0_sample0
 *  and the last value channelN_sampleM.
 *
 * \param  encoder  An initialized encoder instance in the OK state.
 * \param  buffer   An array of channel-interleaved data (see above).
 * \param  samples  The number of samples in one channel, the same as for
 *                  FLAC__stream_encoder_process().  For example, if
 *                  encoding two channels, \c 1000 \a samples corresponds
 *                  to a \a buffer of 2000 values.
 * \assert
 *    \code encoder != NULL \endcode
 *    \code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK \endcode
 * \retval FLAC__bool
 *    \c true if successful, else \c false; in this case, check the
 *    encoder state with FLAC__stream_encoder_get_state() to see what
 *    went wrong.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buffer[], unsigned samples);

/* \} */

#ifdef __cplusplus
}
#endif

#endif